[WoW] System Reboot

Hi.
I start using isboxer for four wow account and it start rebooting my computer. sometimes it takes 1 hour to reboot and sometimes its just couple of minutes
All my hardware are new and used less than a month
its really annoying
My PC build :

Motherboard : Rog strix B450-f Gaming
CPU : Ryzen 5 3600X
VGA : Radeon RX570 4GB
Ram : 16gb DELTA TUF Gaming Alliance RGB
Power : Green 600b-hp-Plus Semi Modular
OS : Windowns 10

I downloaded all drivers from original sites and changing windows and drivers like a hundred times and various version .
Even used so many stress test to see if that happens but everything was normal on test.
In the Windows 10 Event viewer i just get this : The previous system shutdown at 10:57:37 PM on ‎4/‎13/‎2020 was unexpected.
Please help me with this . its making me crazy.

[MiRai]

Even used so many stress test to see if that happens but everything was normal on test.

You don't mention which tests you're using, but usually the best test for what you want is to just do the thing. In other words, if you're testing for stability while gaming, then just play games, but based on what you say about stress testing, can we safely assume that you are overclocking one or more pieces of hardware? If so, the simplest test would be to remove the overclock and play the game.